Introduce ReceiveAuthKey verification for Blinded Payment Paths #4126
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Extends the work started in [PR#3917](lightningdevkit#3917) by adding ReceiveAuthKey-based verification for Blinded Payment Paths. This reduces space previously taken by individual ReceiveTlvs and aligns the verification logic with that used for Blinded Message Paths.
Now that we have introduced an alternate mechanism for authentication in the codebase, we can safely remove the now redundant (hmac, nonce) fields from the Payment ReceiveTlvs's while maintaining the security of the onion messages.
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #4126 +/- ##
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- Coverage 88.57% 88.49% -0.08%
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Files 179 179
Lines 134374 134311 -63
Branches 134374 134311 -63
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- Hits 119016 118861 -155
- Misses 12604 12699 +95
+ Partials 2754 2751 -3
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Building on the goals set forth in #3917, this PR introduces ReceiveAuthKey-based verification for Blinded Payment Paths.
Key Outcomes
ReceiveTlvsare noticeably reduced in size, making blinded paths lighter.Follow-Up Preparation
This PR also lays the groundwork for introducing dummy payment hops in a follow-up PR.
By minimizing per-hop authentication data, we keep dummy hops compact — preserving overall path size and ensuring that forward and dummy TLVs are padded to the same length, improving hop indistinguishability and privacy.